预留岩帽短段掘砌注浆方法在新发煤矿主井井筒封堵含水层中的应用

鸡西矿务局新发煤矿主井井筒在掘进到25m时,涌水量为22.5m3/h,并且有逐渐增大趋势,通过研究井筒检查孔流量测井报告,认为是发育于40m与60m处的风化裂隙承压含水层沿风化裂隙上涌所致,为了保证井筒正常施工,采用了工作面预留岩帽短段掘砌注浆封堵含水层方法,注浆成井45m,水泥消耗量0.78t/m,水玻璃消耗量0.28t/m,工期35d,成井后井筒涌水量4m3/h,达到了预期效果。     

A vertical sounding of severe haze process in Guangzhou area

We detected a severe haze process in Guangzhou area with lidar and microwave radiometer, performed an inversion to get boundary layer height by wavelet covariance transform, and analyzed the correlation between meteorological factors of boundary layer and visibility from the perspective of dynamical and thermodynamic structures. Our results indicate that the boundary layer height shows significant daily changes, consistent with ground visibility variation. During the cleaning process, the boundary layer height exceeded 1 km; during severe haze, the height was only 500 m. Temperature gradient of 50–100 m, which was 30 h lag, was remarkably correlated with visibility, with the correlation coefficient of 0.77. High layer visibility(255 m) and low layer stability were significantly anticorrelation, and the maximum anticorrelation coefficient was up to-0.76 in cleaning days and-0.49 in haze days. In the related boundary layer meteorological factors, surface ventilation coefficient was linearly correlated with ground visibility, with the greatest correlation coefficient of 0.88. The correlation coefficients of boundary layer height, ground wind velocity, relative humidity and ground visibility were 0.76, 0.67, and-0.77, respectively. There was a strong correlation between different meteorological factors. The dominant meteorological factor during this haze process was surface ventilation coefficient. In the area without boundary layer height sounding, ground visibility and wind velocity could be used to estimate boundary layer height.     

吉林省砟子煤矿伴生硬质高岭（土）岩矿床成因类型及开发前景

通过对白山市砟子煤矿竖井矿伴生硬质高岭（土）岩矿床地质特征和成因类型的研究，认为该矿经历了2次成矿作用－沉积和改造。本文叙述了沉积改造在成矿成岩过程中的地质作用，及硬质高岭（土）岩矿床综合利用的可行性和必要性。     

液压起塔定向施工A型钻塔

结合XY系列立轴式岩心钻机的特点，研制开发了与之配套的AY8~15 m系列液压起塔定向施工A型钻塔，并获得了国家实用新型专利。介绍了AY系列钻塔的结构形式、产品特点及应用实例。     

超载预压处理软土的次固结特征及沉降计算

为了研究超载预压软土的次固结特征,分析超载预压处理软土地基的工后沉降,文章考虑应力历史对软土结构性的影响,模拟现场工况,对重塑洞庭湖软土试样进行超载预压后再压缩的一维固结蠕变试验。研究结果表明:经过超载预压的软土卸荷后再进行加载,压缩变形过程中主固结时间明显缩短,约为未经超载预压处理软土主固结时间的1/3,打设排水竖井对软土主固结时间几乎没影响;预压荷载越大,次固结系数越小,超载预压有利于消除软土的次固结沉降;随着建（构）筑物荷载的增加,次固结系数增大;打设排水竖井,未经预压处理软土的次固结系数略有增加,经过超载预压处理软土的次固结系数略有减小,但影响效果不是很明显。考虑应力历史,引入超载增量比,发现次固结系数与超载增量比呈线性递减关系,建立了相应的计算模型,提出了次固结沉降计算公式。试验及分析结果对预压处理地基的设计和施工具有一定的指导意义。     

天津厚地层超长钻孔灌注桩单桩承载特性研究

天津市某主塔楼桩基选用后压浆超长钻孔灌注桩,为了掌握超长后压浆钻孔灌注桩在该地层的工程特性,共设计了2组（共8根）试桩进行单桩竖向抗压静载试验。试桩中安装了振弦式钢筋计和分层沉降管以反映桩侧摩阻力和桩身分层沉降状态。对试验数据进行对比分析和计算结果表明,桩侧注浆可以明显提高超长桩的侧摩阻力;采用预压加载可以增强超长桩的弹性,减少桩顶的沉降;卸荷稳定后试桩具有桩侧阻力,桩身上段所受阻力为负摩阻力,下段为正摩阻力,同时具有的桩身轴力使试桩产生一定的压缩,其压缩量为残余变形量的重要组成部分     

水介质爆破拆除地下桩体的实践

介绍了地下钢筋混凝土桩的控制爆破方法,以及在钻孔设备及外界约束较特殊的情况下,钻孔、装药及起爆等方面的注意事项。     

煤矿送料孔、通风孔及救援孔钻进技术

介绍了煤矿送料孔、通风孔及救援孔等工程钻孔的钻进工艺及所用器具,并通过中国神华集团的施工实例对此类工程钻孔的前导钻进及扩孔钻进技术进行了较为详细的探讨。     

DT-1型高效通风系统在独头平巷通风系统改造工程中的应用

针对河北峪耳崖金矿竖井325中段独头平巷掘进工作面通风中存在的实际问题，重点阐述了DT-1型高效通风系统的性能及推广应用情况，解决了一直制约着该矿独头平巷掘进工作面通风效果的难题。